pystats: #116206 (Incremental GC implementation) broke pystats build

[mdboom]

Bug report

Bug description:

Since #116206 was merged, pystats builds are broken:

gcc -c -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include    -DPy_BUILD_CORE -o Python/gc.o Python/gc.c
In file included from ./Include/internal/pycore_interp.h:16,
                 from ./Include/internal/pycore_ceval.h:13,
                 from Python/gc.c:6:
Python/gc.c: In function ‘gc_collect_young’:
Python/gc.c:1287:24: error: ‘GCStats’ {aka ‘struct _gc_stats’} has no member named ‘objects_queued’; did you mean ‘objects_collected’?
 1287 |         GC_STAT_ADD(0, objects_queued, count);
      |                        ^~~~~~~~~~~~~~
./Include/internal/pycore_code.h:307:82: note: in definition of macro ‘GC_STAT_ADD’
  307 | #define GC_STAT_ADD(gen, name, n) do { if (_Py_stats) _Py_stats->gc_stats[(gen)].name += (n); } while (0)
      |                                                                                  ^~~~
Python/gc.c: In function ‘completed_cycle’:
Python/gc.c:1387:16: warning: unused variable ‘not_visited’ [-Wunused-variable]
 1387 |     PyGC_Head *not_visited = &gcstate->old[gcstate->visited_space^1].head;
      |                ^~~~~~~~~~~
Python/gc.c: In function ‘gc_collect_increment’:
Python/gc.c:1424:20: error: ‘GCStats’ {aka ‘struct _gc_stats’} has no member named ‘objects_queued’; did you mean ‘objects_collected’?
 1424 |     GC_STAT_ADD(1, objects_queued, region_size);
      |                    ^~~~~~~~~~~~~~
./Include/internal/pycore_code.h:307:82: note: in definition of macro ‘GC_STAT_ADD’
  307 | #define GC_STAT_ADD(gen, name, n) do { if (_Py_stats) _Py_stats->gc_stats[(gen)].name += (n); } while (0)
      |                                                                                  ^~~~
Python/gc.c:1424:36: error: ‘region_size’ undeclared (first use in this function)
 1424 |     GC_STAT_ADD(1, objects_queued, region_size);
      |                                    ^~~~~~~~~~~
./Include/internal/pycore_code.h:307:91: note: in definition of macro ‘GC_STAT_ADD’
  307 | #define GC_STAT_ADD(gen, name, n) do { if (_Py_stats) _Py_stats->gc_stats[(gen)].name += (n); } while (0)
      |                                                                                           ^
Python/gc.c:1424:36: note: each undeclared identifier is reported only once for each function it appears in
 1424 |     GC_STAT_ADD(1, objects_queued, region_size);
      |                                    ^~~~~~~~~~~
./Include/internal/pycore_code.h:307:91: note: in definition of macro ‘GC_STAT_ADD’
  307 | #define GC_STAT_ADD(gen, name, n) do { if (_Py_stats) _Py_stats->gc_stats[(gen)].name += (n); } while (0)
      |                                                                                           ^
Python/gc.c: In function ‘_PyGC_Collect’:
Python/gc.c:1810:9: error: ‘_py_stats’ undeclared (first use in this function); did you mean ‘_Py_stats’?
 1810 |     if (_py_stats) {
      |         ^~~~~~~~~
      |         _Py_stats
make: *** [Makefile:2970: Python/gc.o] Error 1

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-117122: Fix pystats after incremental GC changes #117123

[mdboom]

Fixed.